configure

#!/bin/sh

USAGE="usage: configure [--prefix PATH] [--sysconfdir PATH] [--libexecdir PATH] [--localstatedir PATH]"

SRC_DIR="$(dirname "$0")"

prefix=
sysconfdir=
libexecdir=
localstatedir=

while :; do
    case $1 in
        -h|--help)
            echo "${USAGE}"
            exit 0
            ;;

        --prefix)
            if [ "$2" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            prefix="$2"
            shift
            shift
            ;;

        --prefix=?*)
            prefix="${1#*=}"
            if [ "${prefix}}" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            shift
            ;;

        --sysconfdir)
            if [ "$2" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            sysconfdir="$2"
            shift
            shift
            ;;

        --sysconfdir=?*)
            sysconfdir="${1#*=}"
            if [ "${sysconfdir}}" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            shift
            ;;

        --libexecdir)
            if [ "$2" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            libexecdir="$2"
            shift
            shift
            ;;

        --libexecdir=?*)
            libexecdir="${1#*=}"
            if [ "${libexecdir}}" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            shift
            ;;

        --localstatedir)
            if [ "$2" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            localstatedir="$2"
            shift
            shift
            ;;

        --localstatedir=?*)
            localstatedir="${1#*=}"
            if [ "${localstatedir}}" = "" ]; then
                echo "${USAGE}" >&2
                exit 1
            fi
            shift
            ;;

        --?*=?*)
            # unknown option: ignore (dpkg passes extra options)
            shift
            ;;

        --?*)
            # unknown option: ignore (dpkg passes extra options)
            shift
            shift
            ;;

        --)
            shift
            break
            ;;

        *)
            break
    esac
done

if [ $# -ne 0 ]; then
    echo "${USAGE}" >&2
    exit 1
fi

CONFIG_FILE="${SRC_DIR}/mk/config.mk"
rm -f "${CONFIG_FILE}"
if [ ! -z "${prefix}" ]; then
    echo "prefix = ${prefix}" >> "${CONFIG_FILE}"
fi
if [ ! -z "${sysconfdir}" ]; then
    echo "sysconfdir = ${sysconfdir}" >> "${CONFIG_FILE}"
fi
if [ ! -z "${libexecdir}" ]; then
    echo "libexecdir = ${libexecdir}" >> "${CONFIG_FILE}"
fi
if [ ! -z "${localstatedir}" ]; then
    echo "localstatedir = ${localstatedir}" >> "${CONFIG_FILE}"
fi